Multiplayer Game of the Year (best game to play with more than yourself) WWE Smackdown: Here Comes the pain
Sports Game of the Year (Simulation) (Examples: Madden, the ESPN series, Tiger Woods) Madden 2004
Sports Game of the Year (Action) (Examples: Tony Hawk Underground and the like)
Racing Game of the Year (Project Gotham Racing 2, Need For Speed Underground)
Fighting Game of the Year (Wrestling, Virtua Fighter 4: Evolution, Soul Calibur 2) WWE Smackdown: Here Comes the Pain
RPG of the Year (KOTOR, Final Fantasy X-2, Mario and Luigi) KOTOR
Platform Game of the Year (Jak II, Rachet and Clank: Going Commando) Ratchet and Clank: Going Commando
First Person Game of the Year (all shooters, Deus Ex: Invisible War, etc.)
Action Game of the Year (Pretty much everything else. Manhunt, Max Payne 2, Prince of Persia, Crimson Skies) Manhunt
Advenure Game of the Year (Beyond Good and Evil, Wind Waker) The Simpson's Hit and Run
Doesn't fit into any other category Game of the Year (Mario Party, Midway Arcade Treasures, Pac Man vs., Sims)
Most Innovative Game of the Year
*New Category* Online Game of the Year (Socom 2, Rainbow Six 3, Crimson Skies)
Worst Game of the Year Celebrity Deathmatch
Most Dissapointing Game of the Year Celebrity Deathmatch
Most Surprising (surprisingly good that is) Game of the Year - Star Wars: Knights of the old republic.
PC Game of the Year
GBA Game of the Year
XBox Game of the Year - KOTOR
Gamecube Game of the Year
PS2 Game of the Year
Console of the Year
Game of the Year - Star Wars: Knights of the old republic